title: Selective D2 adsorption enhanced by the quantum sieving effect on entangled single-wall carbon nanotubes.
abstract: The quantum sieving effect of D(2) over H(2) is examined at 40 and 77 K by means of experiments and GCMC simulations, for two types of single-wall carbon nanotubes that are distinguishable by their unique entangled structures; (1) a well-bundled SWCNT and (2) loosely-assembled SWCNT produced by the super growth method (SG-SWCNT). Oxidized SWCNT samples of which the so-called internal sites are accessible for H(2) and D(2), are also studied. Experimental H(2) and D(2) adsorption properties on the well-bundled SWCNTs are compared with the simulated ones, revealing that pore-blocking and restricted diffusion of the molecules suppress the high selectivity of D(2) over H(2). The non-oxidized SG-SWCNT assembly shows the highest selectivity among the SWCNT samples, both at 40 and 77 K. The high selectivity of the SG-SWCNT assembly, which is pronounced even at 77 K, is ascribed to their unique assembly structure.
authors.affiliation: Department of Chemistry Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Noguchi
authors.forename: Hideki
authors.initials: H
authors.lastname: Tanaka
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Fujimori
authors.forename: Hirotoshi
authors.initials: H
authors.lastname: Kagita
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Hattori
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Honda
authors.forename: Koki
authors.initials: K
authors.lastname: Urita
authors.forename: Shigenori
authors.initials: S
authors.lastname: Utsumi
authors.forename: Zheng-Ming
authors.initials: ZM
authors.lastname: Wang
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ohba
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kanoh
authors.forename: Kenji
authors.initials: K
authors.lastname: Hata
authors.forename: Katsumi
authors.initials: K
authors.lastname: Kaneko
mesh_terms: D000327:Adsorption; D003198:Computer Simulation; D003903:Deuterium / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008968:Molecular Conformation; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; D006859:Hydrogen; D003903:Deuterium